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Definition of field lens in US English:

field lens

noun

In a multiple lens optical system, the lens farthest from the eye.

‘But, unlike the standard geologist's field lens, this one has a camera.’

‘But according to Honoratio Fabri in his Synopsis Optica (Review of Optics) of 1667, the first microscope with a field lens was built to Monconys's specification in Augsburg in 1660, so anticipating Hooke by several years.’

‘A converging field lens will shorten the eye-relief (the distance from the eyelens to the exit pupil) of a telescope.’

‘It also features mechanical interference in the three-element field lens.’